Mr. Pinball Tip:

A very common problem with Gottlieb solid state machines is that the coin door slam tilt switch or the roll ball tilt switch gets bent or dirty and puts the machine in perpetual tilt. Check to see that these switches are normally closed and have good contact. These are low voltage gold-plated switches and should never be filed, only cleaned with a stiff paper such as a business card.

If you are fed up with these switches failing you can just solder a jumper from them directly to ground, eliminating this problem forever.
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